This graph shows the number of days in October that Carla studied for particular periods of time. For example, on five different days in October she studied for exactly one hour. On how many days in October did Carla study three or more hours?

[asy]size(150,150);
draw((0,10)--(0,0)--(19,0));
for(int i = 1; i<=10; ++i)
{if(i!=5 &&i!= 10)
{draw((-.5,i)--(.5,i)); draw((.5,i)--(19,i),linetype("1 4"));}
else if(i==5)
{draw((-.5,i)--(.5,i),W,linewidth(1.5));draw((.5,i)--(19,i),linetype("1 4"));}
else
{draw((-.5,i)--(.5,i),W,linewidth(1.5)); draw((.5,i)--(19,i),linetype("1 4"));}
}
label("5",(-.5,5),W,fontsize(8pt)); label("10",(-.5,10),W,fontsize(8pt));
for(int i = 0;i<=5;++i)
{label(string(i),(3i+2,-.5),S,fontsize(8pt));
}
void drawrect(int rectnumber, int height)
{filldraw((3*rectnumber-2,0)--(3*rectnumber-2,height)--(3*rectnumber,height)--(3*rectnumber,0)--cycle,white);}
drawrect(1,2); drawrect(2,5); drawrect(3,8); drawrect(4,10); drawrect(5,3); drawrect(6,3);
label(rotate(90)*"\# of days (in Oct.)",(-2.5,5),W,fontsize(8pt)); label("hours studied per day",(19/2,-2.5),S,fontsize(8pt));[/asy]
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
This graph shows the number of days in October that Carla studied for particular periods of time. For example, on five different days in October she studied for exactly one hour. On how many days in October did Carla study three or more hours?

[asy]size(150,150);
draw((0,10)--(0,0)--(19,0));
for(int i = 1; i<=10; ++i)
{if(i!=5 &&i!= 10)
{draw((-.5,i)--(.5,i)); draw((.5,i)--(19,i),linetype("1 4"));}
else if(i==5)
{draw((-.5,i)--(.5,i),W,linewidth(1.5));draw((.5,i)--(19,i),linetype("1 4"));}
else
{draw((-.5,i)--(.5,i),W,linewidth(1.5)); draw((.5,i)--(19,i),linetype("1 4"));}
}
label("5",(-.5,5),W,fontsize(8pt)); label("10",(-.5,10),W,fontsize(8pt));
for(int i = 0;i<=5;++i)
{label(string(i),(3i+2,-.5),S,fontsize(8pt));
}
void drawrect(int rectnumber, int height)
{filldraw((3*rectnumber-2,0)--(3*rectnumber-2,height)--(3*rectnumber,height)--(3*rectnumber,0)--cycle,white);}
drawrect(1,2); drawrect(2,5); drawrect(3,8); drawrect(4,10); drawrect(5,3); drawrect(6,3);
label(rotate(90)*"\# of days (in Oct.)",(-2.5,5),W,fontsize(8pt)); label("hours studied per day",(19/2,-2.5),S,fontsize(8pt));[/asy]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
16
This graph shows the number of days in October that Carla studied for particular periods of time. For example, on five different days in October she studied for exactly one hour. On how many days in October did Carla study three or more hours?

[asy]size(150,150);
draw((0,10)--(0,0)--(19,0));
for(int i = 1; i<=10; ++i)
{if(i!=5 &&i!= 10)
{draw((-.5,i)--(.5,i)); draw((.5,i)--(19,i),linetype("1 4"));}
else if(i==5)
{draw((-.5,i)--(.5,i),W,linewidth(1.5));draw((.5,i)--(19,i),linetype("1 4"));}
else
{draw((-.5,i)--(.5,i),W,linewidth(1.5)); draw((.5,i)--(19,i),linetype("1 4"));}
}
label("5",(-.5,5),W,fontsize(8pt)); label("10",(-.5,10),W,fontsize(8pt));
for(int i = 0;i<=5;++i)
{label(string(i),(3i+2,-.5),S,fontsize(8pt));
}
void drawrect(int rectnumber, int height)
{filldraw((3*rectnumber-2,0)--(3*rectnumber-2,height)--(3*rectnumber,height)--(3*rectnumber,0)--cycle,white);}
drawrect(1,2); drawrect(2,5); drawrect(3,8); drawrect(4,10); drawrect(5,3); drawrect(6,3);
label(rotate(90)*"\# of days (in Oct.)",(-2.5,5),W,fontsize(8pt)); label("hours studied per day",(19/2,-2.5),S,fontsize(8pt));[/asy]
train