25 lines
519 B
C++
25 lines
519 B
C++
#include <stdio.h>
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#include <stdlib.h>
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int main()
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{
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int a,b,s,t;
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int res1, res2, res;
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while(1)
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{
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scanf("%d%d%d%d", &a, &b, &s, &t);
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if(a == 0 && b == 0 && s == 0 && t == 0)
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break;
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a = a%12;
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s = s%12;
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res1 = (a*60+b)*11;
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res2 = (s*60+t)*11;
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if(res2 < res1)
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res2 += 720*11;
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res = res2/720 - res1/720;
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if(res1 == 0)
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res++;
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printf("%d\n", res);
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}
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return 0;
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}
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